Automatic deburring process

ABSTRACT

An automatic deburring process for the burrs produced within the bore of the cylinder block of an automotive engine, and an apparatus therefor, which consists in that a cutting edge shaped to register with the sectional shape of crank case section of the cylinder block is moved in the axial direction of said section, that is, in the direction of the crank shaft housed in said section, for cutting burrs on the internal wall surface of said section off from its base.

United States Patent [1 1 Numao et al. 1 a Mar. 5, 1974 [54] AUTOMATICDEBURRING PROCESS 3,081,673 3/1963 Ansel .f. a. 90/38 x [75] Inventors:Saichi Numao; Yukio Yoneyama, v both of Tochigi, Japan FOREIGN PATENTSOR APPLICATIONS Assigneez Yomzu Jidnsha gy Kabu-Shiki 674,805 7/1952Great Bntam 90153 Kaisha, Kanagawa-ken, Japan 22 Filed; June 1 1972Primary Examinei'Francis S. Husar 21 Appl. No.: 258,581

' 57 ABSTRACT [30] Foreign Application Priority Data I Feb.'8, 1972Japan 47-13753 An automatic debun'ing process for the burrs producedwithin the bore of the cylinder block of an au- U.S- Cl. A, {emotiveengine and an apparatus therefor 90/53, 425/306 consists in that acutting edge shaped to register with Y the ectional hape of rank aseection of the cylinld 0f Search-m 90/24 A, 53, 26; 83/914; der block ismoved in the axial direction of said sec- 425/806; 225/97, 103 tion,that is, in the direction'of the crank shaft housed 1 in said section,for cutting burrs on the intemal wall References Clted surface of saidsection off from its base.

UNITED STATES PATENTS 3,399,585 9/1968 Ahlert 90/24 A 9 Claims, 18Drawing Figures PATENTED 5 I974 SHEET 101 OF 10 PATENTEI] 5 I974 sum 02or 10 FIG. 4

FIG. 3 r

FIG. 7

FIG. 6

PATENTEU 5'974 3.795.175

sum "03 0F 10 00 CD 9 Ki LL- LC) u W 1 L H ML I JUL 00 I FIGSPATENIEBMAR 5 I974 sum son or 1 FIGS PATENTED 5|974 3,795,175

saw us or 10 PAIENTEBHAR 51974 SHEET 08 [1F 10 FIG I5 PATENTED 519743,795,175

sum "09 0F 10 FIG. l6

PATENTED'MR 51914 3.795.175

saw '10 0F 10 1 AUTOMATIC naaunnme PRocEss This invention relates to adeburring unit adapted for removal of the burrs produced on theperiphery of a cylinder block of an automotive engine when cast in amould and, more particularly, to an automatic deburring process forremoval of burrs produced on the inner peripheral surface of thecylinder block which was hitherto considered unfeasible by an automaticprocess. This invention is also directed to the unit for putting theprocess into practice.

In the drawing:

FIG. 1 is a perspective view of an engine cylinder block;

FIG. 2 is a'perspective view similar to FIG. ll, in which the block isturned upside-down;

' FIG. 3 is a vertical sectional view of the cylinder;

FIG. 4 is a sectional view similar to FIG. 3 buttaken along a differentvertical plane;

FIG. 5 is a brief explanatory view of the present invention deburringunit;

FIG. 6 is a front view of cutting edge employed in the present inventionunit;

FIG. 7 is a front view of another cutting edge;

FIG. 8 is a side view of still another cutting edge;

FIG. 9 is a explanatory view showing the operation of cutting edge shownin FIG. 8, which is viewed from the direction B of FIG. 8;

FIG. 10 is a view similarto FIG. 9 but viewed from the direction A inFIG. 8;

FIG. 11 is a front view ofcutting edgesmounted in alignment on a machinebed, which is partly cut open;

FIG. 12 is a plan view of FIG. 10',

FIG. 13 is a front view of FIG. 10;

FIG. 14 is a longitudinal sectional view of the present invention unitof an embodiment;

FIG. 15 is a vertical sectional view of the unit shown in FIG. 14, takenat middle portion thereof;

FIG. 16 is a side view of the present invention unit which is designedso as to be operable automatically,

FIG. 17 is a front view of a cutting edge which is adapted to shear theburr produced about a metal retainer; and

FIG. 18 is a plan viewof FIG. 16.

Referring now to the drawings, the engine cylinder block A cast in amould has the shape usually as shown in FIG. 1. It has a rectangularcylinder section a with a circular opening I for housing a piston, and acrank case section b extending in a skirt fashion from the bottom of thecylinder section a for housing a connecting rod and a crank shaft. Saidcylinder section a and crank case section b are moulded as a singleunit. The burrs produced on the periphery at the time of casting areremoved by means of a deburring system including an au' tomatic grinderadapted forperforming a reciprocating motion relative to the peripheralsurface of the cylinder section a.

However, the burrs are produced not only on the peripheral portion ofthe cylinder block but on the inner wall of the crank case section b onboth sides of the partition wall 2 dividing the crank case bore, and onthe top of the partition wall 2 on the center of the metal retainer 3for supporting crank shaft metal. These burrs 4, 4' are in asemicircular shape and are usually removed by manual operation usinghammers, chisels and other tools.

This is chiefly because the inner wall surface of the cylinder block hasa complicated configuration and this renders it impossible to use theabove-mentioned deburring device including automatic grinders for thedeburring operation. In the automotive industry in which the automationsystem is adopted extensively, the automatic deburring was so farconsidered to be unfeasible.

Therefore, the object of this invention is to provide a process and anapparatus for automatic removal-of burrs from the inner wall surface ofthe'cylinder block which was so far considered an operation which couldnot be automated.

In the conventional deburring procedure, the burrs produced as acontinuous thin-walled flange along the junction line of the mouldhalves are removed gradually by machining from the one end of theflange. On the other hand, according to the present process, a cut,-ting' edge having a shape conforming to the contour line connecting tothe inner wall of the crank case section b is positioned inside the boreof the crank case section b of the cylinder block A and reciprocatedaxially of the crank shaft disposed in the crank case section b. In.this way, the inner endportions of the semicircular burrs 4 are shorn ata time and the burrs 4 are severed from the inner wall surface of thecrank case section b.

FIGS. 3 to 5 show the basic operation performed by the presentinvention. Burrs 4 produced on the bore of the crank case section b areshown in FIGS. 3 and 4. The cutting edges for shearing off the burrs 4are denoted at 5 in FIG. 5. Said cutting edge 5 is formed integrallywith the peripheral part of a blade7 inserted on the base 6 and has ashape substantially in registry with the contour line of the inner edgeconnecting to the inner wall of the crank case section b. In otherwords, said cutting edge has a shape roughly coincident with thesectional configuration of the inner wall'surface of the crank casesection b on which the burrs 4 are produced. Although only one cuttingedge 5 for shearing the burrs 4 is shown in FIG. 5, it is to beunderstood that other cutting edges 5 adapted for removal of burrsproduced on other portions are formed with a shape corresponding to thesectional configuration of such portions on the crank case-section b onwhich the burrs are produced.

The machine bed 6 is so designed and constructed that the cutting edge 5mounted on the blade 7 is movable back and forth axially of the crankcase section b. A mechanism for reciprocating the cutting edge is annexed to the machine bed 6, although such mechanism is not shown in thedrawing. The cylinder block A with burrs 4 formed thereto is carried byany suitable retainer means 8 and is positioned as shown in FIG. 5 withits crank case section b overlying said blade 7 and moreover fixed insuch position. 1

With the cylinder block A and the cutting edge 5 ar ranged in positionas shown in FIG. 5, the machine base v is replaced by a new block A. Theburr 4 can thus be removed by the same procedure as described above.Only one stroke of reciprocation of the cutting edge 4 is sufficient forremoval of the burr 4 as with other shearing systems.

At this time, a relative movement between the cutting edge and thecylinder block A is sufficient and the machine base 6 may be fixed andthe cylinder block A movable.

In short, the inventive deburring process consists in that a cuttingedge 5 shaped to register with the sectional shape of the crank casesection b of the cylinder block A is moved in the axial direction of thesaid section b, that is, in the direction of the crank shaft housed insaid section b, for cutting the burr 4 on the internal wall surface ofthe said section b off from its base. This process is based on suchconception that, since the burr 4 on the internal wall surface of thecylinder block A is formed along a surface perpendicular to the axialdirection of the crank case section [7, such burr can be shorn by movinga cutting edge 5 shaped to register with the sectional shape of thecrank case b in the axial direction of the crank case section b in itsinteriorspace. However, the sectional shape of the crank case section bof the cylinder block A taken in a direction perpendicular to said axialdirection is not identical in shape in said axial direction butconstantly changing so that there is not any portion with the sameshape. It is therefore difficult in effect to move the cutting edge 5 ofthe above-mentioned shape in an axial direction in the inside of thebore of the said section b.

The inventive deburring process has been devised on the basis of thefinding that the sectional shape of the crank case section b is changingin the axial direction but the sectional shape of the said section b isalways constant as far as the narrow zone in the neighborhood of theburr 4 is concerned, and the burr 4 can be removed readily by having thecutting edge 5 shaped so as to be movable through said limited narrowzone.

Thus, the cutting edges 5 used in the present process are not used incommon for removal of the burrs 4 formed on the portions of the bore ofthe crank case section b with different diameters, but are shaped tocoincide with the different sectional configurations of the variousparts of the crank case bore.

It may be feared that, when the cutting edge 5 shaped in this way issupported on the blade 7 in the abovementioned manner and arrangedwithin the bore of the said section b so as to be moved relative theretofor shearing the burr 4, said blade 7 may interfere with the ribs on thepartition wall 2 provided in the crank case bore for supporting themetal retainers 3, or with the metal retainers 3 themselves, as theblade 7 is moved towards the burr 4 in FIG. 5 for shearing. The cuttingedge 5 may also interfere with the internal wall surface of the crankcase section b when moved in the opposite direction.

Another feature of the present invention is that the blade 7 supportingthe cutting edge 5 has openings or cut-outs and has a sufficientthickness to support the cutting edge and that the blade 7 issafeguarded from coming into conflict with or interfering with the crankcase section b in the course of its cutting stroke.

In FIGS. 6 and 7, such preventive measures are shown in detail. Theblade 7 supporting the cutting edge 5 is formed with a cut-out portion7a in a position to register with the metal retainer 3 and with a notch7b in a position to interfere with the projected part on the internalwall of the crank case section b. in addition, the peripheral part ofthe blade 7 is reduced as at 7c and receded from the bore surface of thecrank case section b so as to prevent any interference which mightotherwise be caused when the cutting edge 5 is moved for shearing theburr.

It is moreover unnecessary to support or mount each cutting edge 55 onits individual blade 7. As shown in FIG. 8, on the front and backsurfaces of the blade 7 as viewed in its operating direction areinserted a cutting edge 5 with a contour as shown in FIG. 9 and acutting edge 5 with a contour as shown in FIG. til so that a singleblade 7 will carry said two cutting edges 5, 5".

The blade '7 thus formed is used with the cutting edge placed betweenpartition walls 2, 2 in FIG. 3.

The arrangement described above has such an advantage that the sameblade can be used for supporting two cutting edges 5 and the biade canbe endowed with sufficient strength. As this blade is required to outtwo burrs 4, 4 in different locations, the blade 7' is placed in anintermediate position between said burrs 4, 4. The blade 7' is thenmoved towards one burr 4 from said intcrmediate position for cutting itand then towards the other burr 4i beyond said intermediate position forcutting it and finally returned to said position.

Each cutting edge 5 thus formed may be so designed and arranged that theburrs 4 formed on the internal surface of the crank case section b arecut by the separate operation of the cutting edges 5. However, since theshearing action occurs in the axial direction of the crank case bore andin the inside of the crank case section I) and the burrs 4 formed on thedifferent places are of about the same thickness, the same stroke can beused for shearing, the blade 7 carrying these cutting edges 5 can bemounted in parallel relation on the base 6 as shown in FIGS. 11 to 13.When the machine base 6 is moved, the respective cutting edges 5 can bemoved simultaneously for cutting the respective burrs 4.

FIG. 14 shows an example of the automatic deburring device constructedin the above-mentioned manner. The machine base 6 mounting the blades 7each carrying cutting edges 5 in a parallel relation is secured to abase block it which slides in turn in a horizontal direction on asupport 9 under operation of a hydraulic cylinder system it). Aroundsaid machine base 6, there is mounted a carrier 12 for mounting acylinder block A thereon, said carrier 12 being fixedly positioned withrespect to said support 9. Above said carrier 32, there is provided aretainer device 8 equipped with an arm 14 which can be projected fromand receded into a machine housing i3 by the action of any suitabledrive means so as to abut on and secure said cylinder block A placed onsaid carrier 12. The arrangement is so made that when the cylinder blockA is set in position and the base block 11 reciprocated under the actionof the hydraulic cylinder system lit), the burrs 4 formed on thedifferent places inside the bore of the crank case,

section of the cylinder block can be shorn off and removed concurrently.

It is to be understood that, when the cylinder block A is set inposition by the retaining device 8, the respective cutting edges 5should be mounted on the machine base 6 in such positions as to registerwith the burrs 4 to be cut. Since the blade 7' equipped on its front andrear faces with the said cutting edges 5, 5 is provided in the presentdevice, the reciprocating motion of the machine base 6 for cuttingoperation is the same as the motion required of the blade 7 for cuttingthe burrs.

In the present device, the cutting edge 5 for deburring the bore of thecrank case section b of the cylinder block A is supported upwards on themachine base 6, while the cylinder block A is maintained on the carrier12 so that the crank case section 17 thereof is opened towards the lowerside. This means that the burrs 4 formed on the internal wall of thecrank case section b, when cut by the cutting edge 5 and severed fromthe internal wall of the crank case section b, will be dischargedthrough the opening on the bore of said section b by their own gravity,thus facilitating the disposal of the removed burrs 4.

Moreover, as shown in FIG. 15, the machine base 6 reciprocated with thesupport member, 7 and the base block 11 as well as support 9 forsupporting it are provided with drop openings 15, 16, 1'7 and a chute 18for communicating the bore of the section b of the cylinder block Apositioned on the carrier 12 with the space below the base block 11, inthis way, the burrs 4 severed by the cutting edges 5 and dropped via theopening on the crank case section b to be accumulated around the supportmember 7 can be delivered downwards. This effect can be enhanced byproving a guide plate 25 on the machine base 6, as shown in FIG. 15,said guide plate 25 being adapted for guiding the burrs 4 severed by thecutting edges 5 towards the drop opening 15.

FIG. 16 shows, by way of an example, a fully automatic deburring deviceconsisting of the combination of the above-mentioned automatic deburringdevice with loaders etc. so that the deburring of the cylinder block bythe deburring device as well as the loading and unloading of thecylinder block to and from the deburring device can be performed fullyautomatically.

In the drawing, the automatic deburring device as above-mentioned isdesignated at B and B and comprises a base block 11 movable transverselyon the base 9 by the hydraulic cylinder unit 10, a machine base 6supported on the base block ll (not shown explicitly in the drawing), ablade 7 carring cutting edges 5 mounted in parallel relation on the base6 (not shown explicitly in the drawing), a carrier 12 mounted adjacentto the blade 7 and a positioning unit 8 for position- The loader forloading and unloading cylinder block.

A on said device is shown at C and comprises three clamping units 22which are carried by the bodies 20 movable transversely on the rail 19positioned upwardly of said units B, B and which can be raised andlowered under the action ofthe hydraulic cylinder units 21. The firstclamping unit 22 loads a cylinder block A on the first deburring deviceB, said cylinder block being transferred on a table 23a mounted adjacentto said unit B by means of the conveyor unit 23. The second unit 22'transfers the cylinder block A loaded on the first unit B to the secondunit B. The third unit 22" takes out the block A from the second unit Band places it on a suitable conveyor unit or on a table.

In the first deburring device B, the cutting edges 5 mounted in parallelon the machine base 6 are adapted for cutting the burrs 4 on eithersides of the partition wall 2 within the crank case section b of thecylinder block A. On the other hand, the cutting edges mounted inparallel on the machine base 6 of the second unit B are adapted forcutting burrs 4 formed on the center line of the bearing surface for themetal retainer 8 inside the crank case section I).

Since the cutting edges 5, 5' for shearing different kinds of burrs 4.4' formed in the inside of the crank case section b are mountedseparately on the separate units, the operation of the cutting edges 5'for shearing the burrs 4 produced along the center line of the bearingsurface of the metal retainer 3 is made smooth. Said cutting edges 5'are in the form as shown in FIG. 17, and are of the size that can becontained within the contour line of the cutting edges 5 for cutting theburrs 4, Thus, the cutting edges 4 can be supported on the extension ofthe front surface of the blade 7 for the cutting edges 5. Sucharrangement is shown by the dotted line in FIG. 14 wherein the cuttingedges 5 are adapted exclusively for cutting the burrs 4 produced oneither sides of the partition wall 2. In this case, when the cuttingedges cut the burrs 4 on either sides of the wall 2, the cut burrs willbe contained in the space between the cutting edges 5 and their blade onone hand and the bearing surface for the metal retainer 3 on the other,thus making the cutting operation ineffective. The satisfactory solutionto this problem is provided by such arrangement that the two cuttingedges are prepared separately and mounted on the different deburringunits.

Secondly, according to the above-described embodiment, the cuttingstroke for the burrs formed on either sides of the partition wall may befollowed by the cutting stroke for the burrs 4 formed along the centerline of the bearing surface for the metal retainer 3. ln this way, thecutsurface will be well-defined inasmuch as the blade 7" for the cuttingedges 5 for cutting burrs 4 can be moved by a larger distance.

The numeral 24 denotes a control unit for controlling the operation ofthe deburring units B, B, conveyor unit 23 and loader C. Any knowndevice can be used as this control unit.

What is claimed is: 1. An automatic deburring process for the removal ofburrs produced on the bore of the engine cylinder block comprisingproviding a semicircular blade having axially displaced respectivecutting edges for cutting the semicircular burrs produced on the innerwall of the crank shaft section of the cylinder block of the automotiveengine on both sides of the partition wall for carrying the metalretainer and along the center line of the bearing surface for said metalretainer, said cutting edges being so contoured as to coincide with thelines connecting the base of said burrs contiguous to the inner wall ofsaid block;

placing said blade within the crank-shaft chamber;

axially reciprocating the blade a short axial distance against saidburrs in the inside of the bore of said section in the proximity of saidburrs, thereby severing the burrs along their base portions contiguousto the inner wall of said section and displacing them.

2. An automatic deburring unit for the burrs pro duced inside the boreof the cylinder block of an automotive engine comprising cutting edgescontoured to register with the base lines on the inner wall surface ofthe crank case section of the cylinder block, of the semicircular burrsproduced on said inner wall surface, a blade member carrying saidcutting edges within the bore of the section and in the proximity of theburrs they are adapted to cut, and means for reciprocating said blademember axially of the metal retainer provided in the crank case sectionby a stroke distance necessary for the cutting of the burrs by thecutting edges carried by said blade member.

3. An automatic deburring unit for the burrs produced inside the bore ofthe cylinder block of an automotive engine comprising cutting edgescontoured to register with the base lines on the inner wall surface ofthe crank case section of the cylinder block, ofthe semicircular burrsproduced on said inner wall surface, a blade member carrying saidcutting edges inside the bore of said section and. in the proximity ofthe burrs they are adapted to cut, and means for reciprocating saidblade member axially of the metal retainer provided in the crank casesection by a stroke distance necessary for the cutting of said burrs bythe cutting edges carried by said blade member, characterized by thatthe blade member has an enhanced thickness in the direction of operationof said cutting edges, and is provided with means for preventing thepossible interference with the inner wall surface of said section andthe metal retainer.

4. An automatic deburring unit for the burrs produced within the bore ofan automotive engine comprising cutting edges contoured to register withthe base lines on the inner wall surface of the crank case section ofthe cylinder block, of the semicircular burrs produced on said innerwall surface, a blade member carrying said cutting edges within the boreof the sec-- tion and in the proximity of the burrs they are adapted tocut, and means for reciprocating said blade member axially of the metalretainer provided in the crank case section by a stroke distancenecessary for cutting the burrs by the cutting edges carried by saidblade member, wherein two different cutting edges adapted for cuttingthe burrs produced in the different locations are provided on front andrear sides of the blade member for the cutting edges relative to theoperating direction of the blade member.

5. An automatic deburring unit for the burrs produced within the bore ofan automotive engine comprising cutting edges contoured to register withthe base lines on the inner wall surface of the crank case section ofthe cylinder block, of the semicircular burrs produced on said innerwall surface, a plurality of blade members each carrying cutting edgeswithin the bore of the section and in the proximity of the burrs theyare adapted to cut, and means for reciprocating said blade membersaxially of the metal retainer provided in the crank case section by astroke distance necessary for cutting the burrs by the cutting edgescarred by each said blade member, characterized in that the blademembers for the cutting edges adapted for cutting the burrs produced onthe different locations are arranged and supported in parallel relationon the machine base for cutting the burrs by the reciprocating motion ofthe machine base.

6. An automatic deburring unit for the burrs pro duced inside the boreof the cylinder block of an automotive engine comprising cutting edgescontoured to register with the base lines on the inner wall surface ofthe crank case section of the cylinder block, of the semicircular burrsproduced onsaid wall surface, a blade member carrying said cutting edgesWithin the bore of the section and in the proximity of the burrs theyare adapted to cut, and means for reciprocating said blade member.axially of the metal retainer provided in the crank case section by astroke distance necessary for cutting the burrs by the cutting edgescarried by said blade member, characterized by that the blade membercarrying the cutting edges is mounted upright on the machine basereciprocated sideways by the reciprocating unit and the cylinder blockis positioned so that the crank case section thereof is opened towardsthe underside for the deburring operation.

7. An automatic deburring unit for the burrs pro duced inside the boreof the cylinder block of an automotive engine comprising cutting edgescontoured to register with the base lines on the inner Wall surface ofthe crank case section of the cylinder block, of the semicircular burrsproduced on said inner wall surface, a blade member carrying saidcutting edges within the bore of the section and in the proximity of theburrs they are adapted to cut, and means for reciprocating said blademember axially of the metal retainer provided in the crank case sectionby a stroke distance necessary for cutting the burrs by the cuttingedges car ried by said blade member, characterized by that the blademember carrying the cutting edges is mounted upright on the machine basereciprocated sideways by the reciprocating means, and that a dropopening is provided on the machine base for removal of the severedburrs.

8. An automatic deburring unit for the burrs produced within the bore ofthe cylinder block of an automotive engine comprising cutting edgescontoured to register with the base lines on the inner-wall surface ofthe crank case, section of the cylinder block, of the semicircular burrsproduced on said wall surface, a blade member carrying said cuttingedges within the bore of the section and in the proximity of the burrsthey are adapted to cut, and means for reciprocating said blade memberaxially of the metal retainer provided in the crank case section by astroke distance necessary for cutting the burrs by the cutting edges carried by said blade member, characterized by that only the cutting edgesadapted for cutting the burrs pro duced on both sides of the partitionwall inside the crank case section or the cutting edges adapted forcutting the burrs produced on the bearing surface of the metal retainerare mounted in parallel relation on the machine base reciprocated by thereciprocating unit.

9. An automatic deburring unit for the burrs produced within the bore ofthe cylinder block of an automotive engine comprising cutting edgescontoured to register with the base lines on the inner wall surface ofthe crank case section of the cylinder block, of the semicircular burrsproduced on said wall surface, a blade member carrying said cuttingedges within the bore of the section and in the proximity of the burrsthey are adapted to cut, and means for reciprocating said blade memberaxially of the metal retainer provided in the crank case section by astroke distance necessary for cutting the burrs by the cutting edgescarried by said blade member, characterized by that the automaticdeburring unit is subdivided into a unit section provided with cuttingedges for cutting the burrs located on both sides of a partition wallwithin the crank case section and a unit section provided with cuttingedges for cutting the burrs produced on the bearing surface for themetal retainer, and said unit sections are located in juxtaposition inthe order .described and coordinated by a loader for cylinder blocks sothat the stroke for cutting the burrs located on both sides of thepartition wall is followed by the stroke for cutting the burrs producedon the bearing surface for the metal re-

1. An automatic deburring process for the removal of burrs produced onthe bore of the engine cylinder block comprising providing asemicircular blade having axially displaced respective cutting edges forcutting the semicircular burrs produced on the inner wall of the crankshaft section of the cylinder block of the automotive engine on bothsides of the partition wall for carrying the metal retainer and alongthe center line of the bearing surface for said metal retainer, saidcutting edges being so contoured as to coincide with the linesconnecting the base of said burrs contiguous to the inner wall of saidblock; placing said blade within the crank-shaft chamber; axiallyreciprocating the blade a short axial distance against said burrs in theinside of the bore of said section in the proximity of said burrs,thereby severing the burrs along their base portions contiguous to theinner wall of said section and displacing them.
 2. An automaticdeburring unit for the burrs produced inside the bore of the cylinderblock of an automotive engine comprising cutting edges contoured toregister with the base lines on the inner wall surface of the crank casesection of the cylinder block, of the semicircular burrs produced onsaid inner wall surface, a blade member carrying said cutting edgeswithin the bore of the section and in the proximity of the burrs theyare adapted to cut, and means for reciprocating said blade memberaxially of the metal retainer provided in the crank case section by astroke distance necessary for the cutting of the burrs by the cuttingedges carried by said blade member.
 3. An automatic deburring unit forthe burrs produced inside the bore of the cylinder block of anautomotive engine comprising cutting edges contoured to register withthe base lines on the inner wall surface of the crank case section ofthe cylinder block, of the semicircular burrs produced on said innerwall surface, a blade member carrying said cutting edges inside the boreof said section and in the proximity of the burrs they are adapted tocut, and means for reciprocating said blade member axially of the metalretainer provided in the crank case section by a stroke distancenecessary for the cutting of said burrs by the cutting edges carried bysaid blade member, characterized by that the blade member has anenhanced thickness in the direction of operation of said cutting edges,and is provided with means for preventing the possible interference withthe inner wall surface of said section and the metal retainer.
 4. Anautomatic deburring unit for the burrs produced within the bore of anautomotive engine comprising cutting edges contoured to register withthe base lines on the inner wall surface of the crank case section ofthe cylinder block, of the semicircular burrs produced on said innerwall surface, a blade member carrying said cutting edges within the boreof the section and in the proximity of the burrs they are adapted tocut, and means for reciprocating said blade member axially of the metalretainer provided in the crank case section by a stroke distancenecessary for cutting the burrs by the cutting edges carried by saidblade member, wherein two different cutting edges adapted for cuttingthe burrs produced in the different locations are provided on front andrear sides of the blade member for the cutting edges relative to theoperating direction of the blade member.
 5. An automatic deburring unitfor the burrs produced within the bore of an automotive enginecomprising cutting edges contoured to register with the base lines onthe inner wall surface of the crank case section of the cylinder block,of the semicircular burrs produced on said inner wall surface, aplurality of blade members each carrying cutting edges within the boreof the section and in the proximity of the burrs they are adapted tocut, and means for reciprocating said blade members axially of the metalretainer provided in the crank case section by a stroke distancenecessary for cutting the burrs by the cutting edges carred by each saidblade member, characterized in that the blade members for the cuttingedges adapted for cutting the burrs produced on the different locationsare arranged and supported in parallel relation on the machine base forcutting the burrs by the reciprocating motion of the machine base.
 6. Anautomatic deburring unit for the burrs produced inside the bore of thecylinder block of an automotive engine comprising cutting edgescontoured to register with the base lines on the inner wall surface ofthe crank case section of the cylinder block, of the semicircular burrsproduced on said wall surface, a blade member carrying said cuttingedges within the bore of the section and in the proximity of the burrsthey are adapted to cut, and means for reciprocating said blade memberaxially of the metal retainer provided in the crank case section by astroke distance necessary for cutting the burrs by the cutting edgescarried by said blade member, characterized by that the blade membercarrying the cutting edges is mounted upright on the machine basereciprocated sideways by the reciprocating unit and the cylinder blockis positioned so that the crank case section thereof is opened towardsthe underside for the deburring operation.
 7. An automatic deburringunit for the burrs produced inside the bore of the cylinder block of anautomotive engine comprising cutting edges contoured to register withthe base lines on the inner wall surface of the crank case section ofthe cylinder block, of the semicircular burrs produced on said innerwall surface, a blade member carrying said cutting edges within the boreof the section and in the proximity of the burrs they are adapted tocut, and means for reciprocating said blade member axially of the metalretainer provided in the crank case section by a stroke distancenecessary for cutting the burrs by the cutting edges carried by saidblade member, characterized by that the blade member carrying thecutting edges is mounted upright on the machine base reciprocatedsideways by the reciprocating means, and that a drop opening is providedon the machine base for removal of the severed burrs.
 8. An automaticdeburring unit for the burrs produced within the bore of the cylinderblock of an automotive engine comprising cutting edges contoured toregister with the base lines on the inner wall surface of the crank casesection of the cylinder block, of the semicircular burrs produced onsaid wall surface, a blade member carrying said cutting edges within thebore of the section and in the proximity of the burrs they are adaptedto cut, and means for reciprocating said blade member axially of themetal retainer provided in the crank case section by a stroke distancenecessary for cutting the burrs by the cutting edges carried by saidblade member, characterized by that only the cutting edges adapted forcutting the burrs produced on both sides of the partition wall insidethe crank case section or the cutting edges adapted for cutting theburrs produced on the bearing surface of the metal retainer are mountedin parallel relation on the machine base reciprocated by thereciprocating unit.
 9. An automatic deburring unit for the burrsproduced within the bore of the cylinder block of an automotive enginecomprising cutting edges contoured to register with the base lines onthe inner wall surface of the crank case section of the cylinder block,of the semicircular burrs prOduced on said wall surface, a blade membercarrying said cutting edges within the bore of the section and in theproximity of the burrs they are adapted to cut, and means forreciprocating said blade member axially of the metal retainer providedin the crank case section by a stroke distance necessary for cutting theburrs by the cutting edges carried by said blade member, characterizedby that the automatic deburring unit is subdivided into a unit sectionprovided with cutting edges for cutting the burrs located on both sidesof a partition wall within the crank case section and a unit sectionprovided with cutting edges for cutting the burrs produced on thebearing surface for the metal retainer, and said unit sections arelocated in juxtaposition in the order described and coordinated by aloader for cylinder blocks so that the stroke for cutting the burrslocated on both sides of the partition wall is followed by the strokefor cutting the burrs produced on the bearing surface for the metalretainer.